有4道有理数加法的计算题.要用简便计算.1、0.125+(+3 1/4)+(+7/8)+(-0.25)2、(+3/17)+(-3.36)+{(+7.36)+(+14/17)}3、(-3/4)+(+3 3/8)+(+0.75)+(-4 1/2)+(+1 5/8)4、(+1)+(-2)+(+3
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有4道有理数加法的计算题.要用简便计算.1、0.125+(+3 1/4)+(+7/8)+(-0.25)2、(+3/17)+(-3.36)+{(+7.36)+(+14/17)}3、(-3/4)+(+3 3/8)+(+0.75)+(-4 1/2)+(+1 5/8)4、(+1)+(-2)+(+3
有4道有理数加法的计算题.要用简便计算.
1、0.125+(+3 1/4)+(+7/8)+(-0.25)
2、(+3/17)+(-3.36)+{(+7.36)+(+14/17)}
3、(-3/4)+(+3 3/8)+(+0.75)+(-4 1/2)+(+1 5/8)
4、(+1)+(-2)+(+3)+(-4)+…+(+99)+(-100)
有4道有理数加法的计算题.要用简便计算.1、0.125+(+3 1/4)+(+7/8)+(-0.25)2、(+3/17)+(-3.36)+{(+7.36)+(+14/17)}3、(-3/4)+(+3 3/8)+(+0.75)+(-4 1/2)+(+1 5/8)4、(+1)+(-2)+(+3
1、0.125+(+3 1/4)+(+7/8)+(-0.25)
= (1/8+7/8)+(3 1/4-1/4)
= 1+3
= 4
2、(+3/17)+(-3.36)+{(+7.36)+(+14/17)}
= (3/17+14/17)+(7.36-3.36)
= 1+4
= 5
3、(-3/4)+(+3 3/8)+(+0.75)+(-4 1/2)+(+1 5/8)
= (-3/4+3/4)+(3 3/8+1 5/8)-(4 1/2)
= 5-(4 1/2)
= 1/2
4、(+1)+(-2)+(+3)+(-4)+…+(+99)+(-100)
= (1-2)+(3-4)+……+(99-100)
= -1+(-1)+……+(-1)
= -1*50
= -50
1、0.125+(+3 1/4)+(+7/8)+(-0.25)
=1/8 +(+7/8)+(+3 1/4)-1/4
=1+3
=4
2、(+3/17)+(-3.36)+{(+7.36)+(+14/17)}
=[(+3/17)+(+14/17)] +[(+7.36)-3.36]
=1+4=5
3、(-3/4)+(+3 3/8)+(+0.75)+...
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1、0.125+(+3 1/4)+(+7/8)+(-0.25)
=1/8 +(+7/8)+(+3 1/4)-1/4
=1+3
=4
2、(+3/17)+(-3.36)+{(+7.36)+(+14/17)}
=[(+3/17)+(+14/17)] +[(+7.36)-3.36]
=1+4=5
3、(-3/4)+(+3 3/8)+(+0.75)+(-4 1/2)+(+1 5/8)
= [(-3/4)+(+0.75)+(-4 1/2)] + [(+3 3/8)+(+1 5/8)]
= -4 1/2 + 5 = 1/2
4、(+1)+(-2)+(+3)+(-4)+…+(+99)+(-100)
= [(+1)+(-2)]+ [(+3)+(-4)] +…+[(+99)+(-100)]
= (-1)x50 = -50
收起
1、0.125+(+3 1/4)+(+7/8)+(-0.25)
=1/8+62/8+7/8-2/8
=6/8+62/8
=17/2
2、(+3/17)+(-3.36)+{(+7.36)+(+14/17)}
=3/17-3.36+7.36+14/17
=-2.36+7.36
=5
3、(-3/4)+(+3 3/8)+(+0.75)+(-...
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1、0.125+(+3 1/4)+(+7/8)+(-0.25)
=1/8+62/8+7/8-2/8
=6/8+62/8
=17/2
2、(+3/17)+(-3.36)+{(+7.36)+(+14/17)}
=3/17-3.36+7.36+14/17
=-2.36+7.36
=5
3、(-3/4)+(+3 3/8)+(+0.75)+(-4 1/2)+(+1 5/8)
=-3/4+33/8+3/4-41/2+15/8
=33/8+15/8-168/8
=-120/8
=-15
4、(+1)+(-2)+(+3)+(-4)+…+(+99)+(-100)
=(-1)*100/2
=-50 .
收起
1。 [0.125+(7/8)]+[(+3 1/4)++(-0.25)]=1+3=4
2。(+14/17)+(+3/17)+[(-3.36)+(+7.36)]=1+4=5
3 都化成8为底数,具体就不写了
4。 [(+1)+(-2)]+[(+3)+(-4)]+…[(+99)+(-100)]=-50